Outdoor
Current values look suitable for ordinary outdoor activity for most people.
Why: Low AQI and low pollutant levels support this guidance.
Portland, Oregon, United States
Portland air quality today
Current values look suitable for ordinary outdoor activity for most people.
Data: Current Open-Meteo model estimate
Practical guidance
Running
Current values look suitable for an easy outdoor run.
Why: Low AQI and low pollutant levels support this guidance.
Ventilation
Current values support brief ventilation.
Why: Low AQI and low pollutant levels support brief ventilation.
Air quality and outdoor metrics
US AQI
Air Quality Index
26
Good
PM2.5
Fine particulate matter
4.8µg/m³
Low
PM10
Coarse particulate matter
6.5µg/m³
Low
NO₂
Nitrogen dioxide
4µg/m³
Low
O₃
Ozone
61µg/m³
Moderate
UV index
Sun exposure level
0
Low
Temperature
Air temperature
18°C
Comfortable
Feels like
Apparent temperature
20°C
Comfortable
Wind
Wind speed
1km/h
Light
Humidity
Relative humidity
72%
Humid
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Disclaimer
This information is a general estimate only and is not medical advice.
Location
Portland, United States
Coordinates: 45.5152, -122.6784 · America/Los_Angeles
Interpret AQI for outdoor activity
Calculic's European AQI calculator assesses the value using your population group and planned activity intensity.
Interpret AQI in CalculicThis page's European AQI value, city and timestamp are passed to the calculator through the link.
What affects air quality in Portland
Oregon DEQ identifies ozone and fine particulate matter as the criteria pollutants of most concern in the Portland region.
This is durable regional pollutant and particulate-source context, not a current attainment claim, source ranking, current wildfire event, neighborhood-level condition, forecast, or this site's current-data provenance.
Local monitoring and context
Oregon DEQ says it monitors fine particulate matter, also known as PM2.5, throughout the Portland Metro region.
This describes agency and regional monitoring scope; monitor locations and pollutant sets vary, no single monitor represents citywide conditions, and Oregon DEQ is not this site's current Open-Meteo/CAMS data provider.
City air quality FAQ
How should I read the AQI for Portland?
US AQI condenses air quality into one value. On this page, it helps you quickly judge whether conditions look good, moderate or more polluted than usual.
Is the air quality good for going outside?
Check the outdoor and running cards first. They combine AQI, particles, ozone, weather and other factors that can affect outdoor comfort.
Should I ventilate right now?
The ventilation card considers AQI and pollutants such as particles, nitrogen dioxide and ozone. If values are elevated, a shorter opening or a later moment may be better.
Why can air quality change during the day?
Weather, emissions, ozone formation, particles and air flow can shift local conditions, so the next hours can differ from the current reading.
Sources and methodology
Current data
This page uses US AQI.
Current and hourly air-quality values are CAMS-based model estimates, not measurements from a local monitoring station. They may not reflect street-level conditions.
- Displayed state
- Current model estimate
- Data time
- 3 Sept 2026, 02:00 am
- Data source
- Open-Meteo
Evergreen city statements
Each local statement is linked to a checked primary-authority source. A source check is editorial provenance and does not describe current-data freshness.
Local sources support the background claims below; they are not the source of the current data shown above unless explicitly stated otherwise.
Authoritative sources for local statements
Air Quality in the Portland Region
Oregon Department of Environmental Quality
- Scope
- Portland region
- Source checked
- 29 Aug 2026
The page identifies ozone and fine particulate matter as Portland-region criteria pollutants of most concern and says DEQ monitors PM2.5 throughout the Portland Metro region.
Applicability: Official regional material supports pollutant-priority and Portland Metro PM2.5-monitoring context; its current federal-standards statement is deliberately not used.
Based on this source: Oregon DEQ identifies ozone and fine particulate matter as the criteria pollutants of most concern in the Portland region.
Oregon DEQ says it monitors fine particulate matter, also known as PM2.5, throughout the Portland Metro region.